“…The authors recommended chest CT for high-risk patients, especially during the follow-up period [24]. Likewise, Manikantan et al [23] reviewed the literature and also recommended chest CT, instead of chest X-rays, for the detection of lung metastasis in patients who could be actively treated. Ultrasound is superior to the palpation for detection and classification of cervical lymph node metastasis and has the advantages of simplicity, its noninvasive nature, its lack of radiation exposure, and lower cost than CT, MRI, and FDG-PET [2,15,27,28]; Yuasa et al [2] evaluated the sonographic characteristics of metastatic cervical lymph nodes in an effort to identify adequate time intervals for follow-up sonography of the neck among tongue cancer patients.…”